Polyesters of N,N-di-alkanol-amines with di-(hydroxy-alkyl-benzyl) malonic acids and use thereof as stabilizers for polymers
AssigneeMontedison S.p.A.
InventorsPiero Di Battista, Giuseppe Nelli, Francesco Gratani
Life of this patent
Estimating the term…
Abstract
New polyesters of N,N-di-alkanol-amines with di-(hydroxy-alkyl-benzyl) malonic acids are disclosed. The new polyesters are useful for stabilizing thermoplastic polymers, in particular polyolefins, against sunlight, heat and oxidation. A process for producing the new polyesters is also disclosed, as well as the polymeric compositions stabilized with said new polyesters.
Claims14
Polyesters of N,N-di-alkanol-amines with di-(hydroxy-alkyl-benzyl)malonic acids, having the general formula:
- ##STR13## wherein:
- each of R.sub.1 and R.sub.2, which may be the same or different, is an alkyl radical having 1 to 6 carbon atoms, an aralkyl radical having 7 to 9 carbon atoms or a cyclo-alkyl radical having 5 to 8 carbon atoms;
- A is a nitrogen containing divalent radical selected from the group consisting of:
- (a) a radical ##STR14## in which R.sub.3 may be an alkyl radical having 1 to 12 carbon atoms, an aryl radical having 6 to 12 carbon atoms or an alkyl-substituted piperidyl radical of the type:
- ##STR15## wherein:
- each of R.sub.4, R.sub.5, R.sub.6 and R.sub.7, which may be the same or different, is an alkyl radical having 1 to 4 carbon atoms, and R.sub.8 is hydrogen or an alkyl radical having 1 to 4 carbon atoms;
- (b) a radical ##STR16## wherein R.sub.3 has the same meaning specified hereinbefore and B is an alkylene radical having 2 to 12 carbon atoms or a cyclo-alkylene radical having 3 to 12 carbon atoms;
- (c) a radical ##STR17## wherein:
- each of R.sub.9, R.sub.10, R.sub.11, R.sub.12, R.sub.13, R.sub.14, R.sub.15 and R.sub.16, which may the same or different is hydrogen or an alkyl radical having 1 to 4 carbon atoms, or two by two belong to an aliphatic or aromatic cycle having 5 to 12 carbon atoms;
- m is an integer from 1 to 12 and
- n is an integer from 2 to 100.
Compositions of thermoplastic synthetic polymers, stabilized to oxidation and to ageing, having incorporated therein, in an amount sufficient to prevent any degradation of the polymer, a polyester of a N,N-di-alkanol amine with a di-(hydroxy-alkyl-benzyl)malonic acid, having the general formula:
- ##STR18## wherein:
- each of R.sub.1 and R.sub.2, which may be the same or different, is an alkyl radical having 1 to 6 carbon atoms, an aralkyl radical having 7 to 9 carbon atoms or a cyclo-alkyl radical having 5 to 8 carbon atoms;
- A is a nitrogen containing divalent radical selected from the group consisting of:
- (a) a radical ##STR19## in which R.sub.3 may be an alkyl radical having 1 to 12 carbon atoms, an aryl radical having 6 to 12 carbon atoms, or an alkyl-substituted piperidyl radical of the type:
- ##STR20## wherein:
- each of R.sub.4, R.sub.5, R.sub.6 and R.sub.7, which may be the same or different, is an alkyl radical having 1 to 4 carbon atoms, and R.sub.8 is hydrogen or an alkyl radical having 1 to 4 carbon atoms;
- (b) a radical ##STR21## wherein R.sub.3 has the same meaning specified hereinbefore and B is an alkylene radical having 2 to 12 carbon atoms or a cyclo-alkylene radical having 3 to 12 carbon atoms;
- (c) a radical ##STR22## wherein:
- each of R.sub.9, R.sub.10, R.sub.11, R.sub.12, R.sub.13, R.sub.14, R.sub.15 and R.sub.16, which may be the same or different, is hydrogen or an alkyl radical having 1 to 4 carbon atoms, or two by two belong to an aliphatic or aromatic cycle having 5 to 12 carbon atoms;
- m is an integer from 1 to 12 and
- n is an integer from 2 to 100.
Dependencies are inferred from the claim text.